close by the garden wall

[I]n the village of World's End, at the furthest end of Last Street, there is a hole that you take to be a well, close by the garden wall, but that if you lower yourself by your hands over the edge of the hole, and feel about with your feet till they find a ledge, that is the top step of a flight of stairs that takes you down over the edge of the World. "For all that men know, those stairs may have a purpose and even a bottom step," said the arch-idolater, "but discussion about the lower flights is idle." Then the teeth of Pombo chattered, for he feared the darkness, but he that made idols of his own explained that those stairs were always lit by the faint blue gloaming in which the World spins.

-- Lord Dunsany The Book of Wonder

Lord Dunsany

Lord Dunsany at Wikipedia

The Book of Wonder